2/21/2023 0 Comments Proxy https wireshark trafficNote that you won’t see the X-Forwarded-For header here, because I captured at the client and not between the proxy and the webserver. Direct HTTP connection HTTP Proxy connection (Note that the proxy server can run on different ports, e.g., 80, 8080, 3128.) The proxy IP came from a free proxy list (link below). Note that the arrows in the figure show only the first HTTP packet flow, though it is a bi-directional communication in which the returning packets have the inverse order of source/destination IPs and ports.Īs an example, I opened my What-is-my-IP script at two times: The first one without a proxy and the second one with a proxy on port 3128. In the case of a proxy, the HTTP X-Forwarded-For header with the client IP address might be inserted. In both scenarios, the “Host” value in the HTTP request is set to the requested domain. No DNS query is sent from the client itself. And since it is a “real” proxy, both packets are inside its own TCP connection with different source addresses as well. The second packet is sent from the proxy to the final destination. The requested URI shows the complete URL (host + path). HTTP proxy requests: The first packet is sent to the proxy. Preceding is a DNS request from the client to its configured recursive DNS server. Direct HTTP requests: Destination IP is the HTTP server and the requested URI shows only the path behind the domain.Following is the main figure for this article.
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